# mcrypt_module_open

(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

mcrypt_module_open — Opens the module of the algorithm and the mode to be used

Warnung

Diese Funktion wurde in PHP 7.1.0 als DEPRECATED (veraltet) markiert und wurde in PHP 7.2.0 ENTFERNT. Von der Verwendung dieser Funktion wird dringend abgeraten.

### Beschreibung

mcrypt_module_open(
string `$algorithm`,
string `$algorithm_directory`,
string `$mode`,
string `$mode_directory`
): resource

This function opens the module of the algorithm and the mode to be used. The name of the algorithm is specified in algorithm, e.g. `"twofish"` or is one of the `MCRYPT_ciphername` constants. The module is closed by calling mcrypt_module_close().

### Parameter-Liste

`algorithm`

  Eine der Konstanten von `MCRYPT_ciphername` oder der Name eines Algorithmus als Zeichenkette.

`algorithm_directory`
  The `algorithm_directory` parameter is used to locate the encryption module. When you supply a directory name, it is used. When you set it to an empty string (`""`), the value set by the `mcrypt.algorithms_dir` php.ini directive is used. When it is not set, the default directory that is used is the one that was compiled into libmcrypt (usually /usr/local/lib/libmcrypt).
`mode`

  Eine der `MCRYPT_MODE_modename`-Konstanten oder eine der folgenden Zeichenketten: "ecb", "cbc", "cfb", "ofb", "nofb" oder "stream".

`mode_directory`
  The `mode_directory` parameter is used to locate the encryption module. When you supply a directory name, it is used. When you set it to an empty string (`""`), the value set by the `mcrypt.modes_dir` php.ini directive is used. When it is not set, the default directory that is used is the one that was compiled-in into libmcrypt (usually /usr/local/lib/libmcrypt).

### Rückgabewerte

Normally it returns an encryption descriptor, or `false` on error.

### Beispiele

Beispiel #1 mcrypt_module_open() Examples

`<?php
$td = mcrypt_module_open(MCRYPT_DES, '',
MCRYPT_MODE_ECB, '/usr/lib/mcrypt-modes');
$td = mcrypt_module_open('rijndael-256', '', 'ofb', '');
?>`

The first line in the example above will try to open the `DES` cipher from the default directory and the `ECB` mode from the directory /usr/lib/mcrypt-modes. The second example uses strings as name for the cipher and mode, this only works when the extension is linked against libmcrypt 2.4.x or 2.5.x.

Beispiel #2 Using mcrypt_module_open() in encryption

`<?php
/* Open the cipher */
$td = mcrypt_module_open('rijndael-256', '', 'ofb', '');
/* Create the IV and determine the keysize length, use MCRYPT_RAND
* on Windows instead */
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
$ks = mcrypt_enc_get_key_size($td);
/* Create key (example only: MD5 is not a good hash algorithm for this) */
$key = substr(hash('md5', 'very secret key'), 0, $ks);
/* Intialize encryption */
mcrypt_generic_init($td, $key, $iv);
/* Encrypt data */
$encrypted = mcrypt_generic($td, 'This is very important data');
/* Terminate encryption handler */
mcrypt_generic_deinit($td);
/* Initialize encryption module for decryption */
mcrypt_generic_init($td, $key, $iv);
/* Decrypt encrypted string */
$decrypted = mdecrypt_generic($td, $encrypted);
/* Terminate decryption handle and close module */
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
/* Show string */
echo trim($decrypted) . "\n";
?>`

### Siehe auch

- mcrypt_module_close() - Closes the mcrypt module
- mcrypt_generic() - This function encrypts data
- mdecrypt_generic() - Decrypts data
- mcrypt_generic_init() - This function initializes all buffers needed for encryption
- mcrypt_generic_deinit() - This function deinitializes an encryption module

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